| abstract |
A monomer of formula (III): wherein X is a polymerizable group, Ar, Ar 1 and Ar 2 each independently represent an optionally substituted aryl or heteroaryl group; R 1 represents H or a substituent; and Z represents a direct bond or a divalent linking atom or group, Ar 1 and Ar 2 linking via a single bond or a divalent linking group selected from CR 1 R 2 , SiR 1 R 2 , PR 1 , NR 1 , O and S wherein R 1 and R 2 are independently selected from hydrogen; optionally substituted alkyl, wherein one or more non-adjacent C atoms may be replaced by O, S, N, C = O and -COO-; Alkoxy, aryl, arylalkyl, heteroaryl and heteroarylalkyl. Ar 1 and Ar 2 are preferably bridged by an oxygen atom, and Ar 1 and / or Ar 2 may be condensed with their respective adjacent Ar groups. Ar 1 and its adjacent Ar group and / or Ar 2 and its adjacent Ar group are optionally condensed to form a fluorene unit. |